Maybe some of you have come up with someone you know who has SSD, or perhaps you yourself have SSD. It is NOT unusual because according to this study it is estimated that more than 7% of adults in U.S. have certain degree of SSD!!
To most people this number might be beyond imagination. Some might say there are not so much people with SSD around them. However, even though you think none of your acquaintances have SSD, it does not mean that they actually do not have SSD. Unlike people with bilateral hearing loss whose both ears are impaired, people with SSD can hardly be distinguished in daily lives because they act and speak normally. Besides, In fact, many of people with SSD are reluctant to tell others about their symptoms. Some people say it is hard to talk about SSD even with their best friend.
This may be one reason problems of SSD is not fully recognized by many people.